Improvement in dies for making key-blanks



E. PARKER.

Improvement in Dies for Making Key-Blanks. N0. 128,650. Patentedl uly 2,1872

Fig.1; B

Fig. eL.

UNITED STATES PATENT OFFICE.

EMERY PARKER, OF NEW BRITAIN, CONNECTICUT.

IMPROVEMENT IN DIES FOR MAKING KEV-BLANKS.

Specification forming part of Letters Patent No. 128,650, dated July 2, 1872.

ment of the dies described, which produce a succession of forms, hereinafter described.

In the accompanying drawing, Figure 1 shows a face view of one of the die-blocks employed in practicing this invention; Fig. 2, a side view of said die-blocks Fig. 3, a view of the rod from which the blanks are formed;

and Figs. 4, 5, and 6 are side, edge,and side' views, showing the various forms that the metal assumes upon being subjected to the several dies.

The die-blocks A and B are placed in any of the ordinary devices for operating dies in the usual manner. The rod 0, preferably of rectangular form, is hea and placed between the die 1 edgewisethat is, with its broadest sides in a vertical position. TIiedieblocks are then forced together, when the die 1 swages the rod C into the form shown'at the left, and designated a in Figs. 4 and 5. The rod C is then held flatwise and the swaged portion a is placed between and operated upon by the die 2, forming said portion into the shape'shown at the left, and designated b in Fig. 6. The rod C is then held edge-wise and the swaged portion, 11 placed between the die 3, while at the same time a portion of the rod 0 not yet operated upon is placed between the die 1. The operation of the diesl and 3 will then form the metal into the forms shown in Figs. 4 and 5, that portion formed by the die 3 being designated 0 and shown at the right. The portions or and 0 thus swaged, (the rod C being held flatwise,) are placed between and operated upon by the dies 2 and4, throwing the metal into the form shown in Fig. 6, the portion thereof formed by the die 4 being designated d and shown at the right. The result of the last operation of die 4 is (by merely trimming or shearing off the fin e) a finished keyblank. Extending from and surrounding the die 4 is a shallow recess, to make room for the surplus metal or fin of the key-blank. By arranging the dies 1 and 3 upon one line and the dies 3 and 4 upon another, as shown, the four successive operations of the dies (after the first key-blank is swaged) are performed by only two blows of the die-blocks. It will be observed that that portion of the rod which forms the shank of the key-blank is compressed first in one direction and then in a transverse direction, successively, by each of the respective dies, whereby the metal is so drawn as to remove a large share of the surplus stock, which would otherwise remain at said point. If desired, a key-blank might be formed from the rod C by the use of dies 3 and 4 only, but by such use a greater portion of metal would be thrown into the fin around the shank and consequently involve a waste of stock. It is not necessary, in order to practice this invention, to arrange the dies in pairs of 1 3 and 2 4, as described, but it is preferable to do so.

I claim as my invention- The progressive formation of key-blanks from a rod of metal by the employment of the dies 1, 2, 3, and 4, substantially as described, producing the succession of forms, substantially as specified.

EMERY PARKER. Witnesses:

HENRY E. RUSSELL, 2d, LEONARD DoIz. 

